107 lines
3.1 KiB
Haskell
107 lines
3.1 KiB
Haskell
{-# LANGUAGE QuasiQuotes #-}
|
|
{-# LANGUAGE OverloadedStrings #-}
|
|
{-# LANGUAGE FlexibleContexts #-}
|
|
{-# LANGUAGE TemplateHaskell #-}
|
|
{-# LANGUAGE ViewPatterns #-}
|
|
|
|
module GHCup.Utils.File.Common where
|
|
|
|
import GHCup.Utils.Prelude
|
|
|
|
import Control.Monad.Extra
|
|
import Control.Monad.Reader
|
|
import Data.Maybe
|
|
import Data.String.Interpolate
|
|
import GHC.IO.Exception
|
|
import Optics hiding ((<|), (|>))
|
|
import System.Directory
|
|
import System.FilePath
|
|
import Text.PrettyPrint.HughesPJClass hiding ( (<>) )
|
|
import Text.Regex.Posix
|
|
|
|
import qualified Data.ByteString.Lazy as BL
|
|
|
|
|
|
|
|
data ProcessError = NonZeroExit Int FilePath [String]
|
|
| PTerminated FilePath [String]
|
|
| PStopped FilePath [String]
|
|
| NoSuchPid FilePath [String]
|
|
deriving Show
|
|
|
|
instance Pretty ProcessError where
|
|
pPrint (NonZeroExit e exe args) =
|
|
text [i|Process "#{exe}" with arguments #{args} failed with exit code #{e}.|]
|
|
pPrint (PTerminated exe args) =
|
|
text [i|Process "#{exe}" with arguments #{args} terminated.|]
|
|
pPrint (PStopped exe args) =
|
|
text [i|Process "#{exe}" with arguments #{args} stopped.|]
|
|
pPrint (NoSuchPid exe args) =
|
|
text [i|Could not find PID for process running "#{exe}" with arguments #{args}.|]
|
|
|
|
data CapturedProcess = CapturedProcess
|
|
{ _exitCode :: ExitCode
|
|
, _stdOut :: BL.ByteString
|
|
, _stdErr :: BL.ByteString
|
|
}
|
|
deriving (Eq, Show)
|
|
|
|
makeLenses ''CapturedProcess
|
|
|
|
|
|
|
|
-- | Search for a file in the search paths.
|
|
--
|
|
-- Catches `PermissionDenied` and `NoSuchThing` and returns `Nothing`.
|
|
searchPath :: [FilePath] -> FilePath -> IO (Maybe FilePath)
|
|
searchPath paths needle = go paths
|
|
where
|
|
go [] = pure Nothing
|
|
go (x : xs) =
|
|
hideErrorDefM [InappropriateType, PermissionDenied, NoSuchThing] (go xs)
|
|
$ do
|
|
contents <- listDirectory x
|
|
findM (isMatch x) contents >>= \case
|
|
Just _ -> pure $ Just (x </> needle)
|
|
Nothing -> go xs
|
|
isMatch basedir p = do
|
|
if p == needle
|
|
then isExecutable (basedir </> needle)
|
|
else pure False
|
|
|
|
isExecutable :: FilePath -> IO Bool
|
|
isExecutable file = executable <$> getPermissions file
|
|
|
|
|
|
-- | Check wether a binary is shadowed by another one that comes before
|
|
-- it in PATH. Returns the path to said binary, if any.
|
|
isShadowed :: FilePath -> IO (Maybe FilePath)
|
|
isShadowed p = do
|
|
let dir = takeDirectory p
|
|
let fn = takeFileName p
|
|
spaths <- liftIO getSearchPath
|
|
if dir `elem` spaths
|
|
then do
|
|
let shadowPaths = takeWhile (/= dir) spaths
|
|
searchPath shadowPaths fn
|
|
else pure Nothing
|
|
|
|
|
|
-- | Check whether the binary is in PATH. This returns only `True`
|
|
-- if the directory containing the binary is part of PATH.
|
|
isInPath :: FilePath -> IO Bool
|
|
isInPath p = do
|
|
let dir = takeDirectory p
|
|
let fn = takeFileName p
|
|
spaths <- liftIO getSearchPath
|
|
if dir `elem` spaths
|
|
then isJust <$> searchPath [dir] fn
|
|
else pure False
|
|
|
|
|
|
findFiles :: FilePath -> Regex -> IO [FilePath]
|
|
findFiles path regex = do
|
|
contents <- listDirectory path
|
|
pure $ filter (match regex) contents
|
|
|